// Copyright 2016 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_COMPRESSION_MESH_MESH_DECODER_H_
#define DRACO_COMPRESSION_MESH_MESH_DECODER_H_

#include "draco/compression/attributes/mesh_attribute_indices_encoding_data.h"
#include "draco/compression/point_cloud/point_cloud_decoder.h"
#include "draco/mesh/mesh.h"
#include "draco/mesh/mesh_attribute_corner_table.h"

namespace draco {

// Class that reconstructs a 3D mesh from input data that was encoded by
// MeshEncoder.
class MeshDecoder : public PointCloudDecoder {
  public:
    MeshDecoder();

    EncodedGeometryType GetGeometryType() const override {
        return TRIANGULAR_MESH;
    }

    // The main entry point for mesh decoding.
    Status Decode(const DecoderOptions &options, DecoderBuffer *in_buffer,
                  Mesh *out_mesh);

    // Returns the base connectivity of the decoded mesh (or nullptr if it is not
    // initialized).
    virtual const CornerTable *GetCornerTable() const {
        return nullptr;
    }

    // Returns the attribute connectivity data or nullptr if it does not exist.
    virtual const MeshAttributeCornerTable *GetAttributeCornerTable(
        int /* att_id */) const {
        return nullptr;
    }

    // Returns the decoding data for a given attribute or nullptr when the data
    // does not exist.
    virtual const MeshAttributeIndicesEncodingData *GetAttributeEncodingData(
        int /* att_id */) const {
        return nullptr;
    }

    Mesh *mesh() const {
        return mesh_;
    }

  protected:
    bool DecodeGeometryData() override;
    virtual bool DecodeConnectivity() = 0;

  private:
    Mesh *mesh_;
};

}  // namespace draco

#endif  // DRACO_COMPRESSION_MESH_MESH_DECODER_H_
